Hi,
Thanks for your help Iare and wcr3d, actually it helps me a lot. Now i have edited my .chat folder to this :
#
# Some of these options found documented at:
#
#
# Others are based on the peer file in XmBlackBerry
#
# Please send all working peer files to, so we can
# build a library of peer files for different carriers.
#
ABORT ERROR
'' AT&F
OK ATZ
OK ATI
OK AT+CGDCONT=1,"IP","ebouygtel.com"
OK ATDT*99#
CONNECT

my bb file is :

# Some of these options found documented at:
#
#
# Others are based on the peer file in XmBlackBerry
#
# Please send all working peer files toxxxx so we can
# build a library of peer files for different carriers.
#

connect "/usr/sbin/chat -f /etc/chatscripts/barry-sprint.chat"

#
# authentication options - no need for ISP to authenticate to us, but
# we may need a login here: user/password/name
#
noauth
user guest
password guest
name wapuser